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Re: [Xen-users] PV networking issue in 2.6.38.6 and 2.6.39-rc7

To: erwan.renier@xxxxxxxxxxx
Subject: Re: [Xen-users] PV networking issue in 2.6.38.6 and 2.6.39-rc7
From: Mario <mario@xxxxxxxxxxxxxx>
Date: Sun, 15 May 2011 18:27:08 +0200
Cc: todd.deshane@xxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx, Pasi Kärkkäinen <pasik@xxxxxx>
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As far as getting 2.6.38.6 running as dom0, few moments ago I have just made a working version by patched it with gentoo rebased patches, and so far everything runs nicely :-) But this means all in-kernel xen code is probably replaced with stuff from those patches..


On 05/15/2011 06:24 PM, Erwan RENIER wrote:
I did the test too with vanilla kernel a while ago and ran into the same
problem, thought i didn't search it out.
Instead i used the konrad xen kernel wich is 2.6.38-8 and works fine (
almost ^^ ).
I suppose he made adjustment on the network stack and it should be good
to check the diffs with the vanilla kernel to find out.

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git


Le 15/05/2011 18:12, Pasi Kärkkäinen a écrit :
On Sun, May 15, 2011 at 06:02:02PM +0200, Mario wrote:
On 05/15/2011 05:53 PM, Pasi Kärkkäinen wrote:
On Sun, May 15, 2011 at 02:36:11PM +0200, Mario wrote:
Hey everyone,

I have been trying to make Xen-4.1.0 work on kernels mentioned in the
subject, without much sucess. HVM guests are not affected, only PV.

Below you mention gentoo xenlinux patches..

So please be more specific about which kernel was vanilla (pvops),
and which kernels had some external patches applied..

-- Pasi

Sorry, both kernels in subject were vanilla from kernel.org, with xen
options selected for dom0 usage.
I only wanted to point out that networking works if i use kernel patched
with rebased gentoo patches.
I am talking only about dom0 kernel here, domU kernel does not seem to
be the source of the problem.

OK. What kernel is the PV domU running? What Xen version are you
using? 4.1 ?

-- Pasi

Error that i see in dmesg on the domU:
XENBUS: Timeout connecting to device: device/vif/0 (state 1)

ifconfig -a on domU shows MAC address: 00:00:00:00:00:00

dom0 doesn't have any vif/tap interfaces assigned to domU when i do
brctl show or ifconfig -a

I don't see any errors worth mentioning in /var/log/xen, except mybe
these two:

/tmp/SBo/xen-4.1.0/tools/ioemu-qemu-xen/hw/xen_blktap.c:628: Init
blktap
pipes
Could not open /var/run/tap/qemu-read-2

Problem goes away when i boot 2.6.34.7 (it is the last kernel that i
have built with gentoo rebased patches).

If there is something i can do to help debug this please do let me
know.


Best regards,
mario

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